I did another test at another database, where I set up a defined user for webservices and granted this user execution privileges on the same testfunction. Accessing this function via SQL works OK. But when I issue a similar URL (http://localhost:8080/wwwsss/WSBRAN/TESTWS?wsdl) I get:

"ERROR 501: Not Implemented."

I did not find an error in my setup yet - so maybe somebody can hint me on the deeper meaning of this error! Where can I look to fix this?